Sorry I thought it said the "funniest trail" - but I'll post on that basis anyway - The Barbie Trail at Cannock which features (well it used to I haven't noticed them for a while now I come to think about it!) various Barbie & Ken figures in various states of undress and disassembly.

Nah the old end sections were better than the newer ones. They were good but they chopped down the rollers and ruined them, the rest of it is just churned up and rutted and generally wasted. Any section on the Monkey is far better fun than the end of the Dog